Dosimetric Parameters and Diffusion Coefficient through Fricke Xylenol Gel dosimeter, for Small Field Sizes Electron Beams / Parâmetros dosimétricos e coeficiente de difusão para elétrons em campos pequenos, através do dosímetro Fricke Xilenol Gel

AUTOR(ES)

Lucas Nonato de Oliveira

DATA DE PUBLICAÇÃO

2007

RESUMO

Dosimetric parameters such as Percentage Depth Dose, Field Profile and Output Factor are necessary in radiotherapy routine, once they can help to improve the quality of the treatment and consequently of the absorbed dose delivered to the tumor. In this work the dosimetric parameters for electron beams of 8 and 10 MeV were measured with the chemical dosimeter Fricke Xylenol Gel for small field sizes (square and circular) and were compared with those obtained with an ionization chamber. The chemical dosimeter signal, given by the complex Fe+3 - Xylenol concentration, has a temporal dependency, to which its diffusion coefficient was determined together with the activation energy, necessary for the Fe+3 migrations in the gel. These two parameters were measured, for the first time, for the Fricke Xylenol Gel and for that a novel methodology was also created. The measured parameters, dosimetric ones together with the diffusion coefficient and activation energy corroborate, to present the chemical dosimeter, as an adequate one to be used in radiotherapy with electron beams for small field sizes.

ASSUNTO(S)

fricke gel dosimeter fricke xilenol gel

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